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Related Experiment Videos

Serial hematologic changes and pregnancy outcome

P G Whittaker1, S Macphail, T Lind

  • 1University Department of Obstetrics and Gynaecology, Royal Victoria Infirmary, Newcastle, United Kingdom.

Obstetrics and Gynecology
|July 1, 1996
PubMed
Summary
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Low hemoglobin in pregnancy is primarily due to plasma volume expansion, not poor nutrition. This hematologic change does not correlate with birth weight or placental weight ratio.

Area of Science:

  • Obstetrics and Gynecology
  • Maternal-Fetal Medicine
  • Hematology

Background:

  • Maternal hematologic changes during pregnancy are common.
  • The relationship between these changes, placental hormones, and fetal growth is not fully understood.

Purpose of the Study:

  • To investigate the association between maternal hematologic indices and placental protein hormones.
  • To reevaluate the link between maternal hematologic status, birth weight, and placental weight ratio.

Main Methods:

  • Prospective study of 69 normal women.
  • Serial measurements of plasma volume, hematologic indices, and placental hormones.
  • Assessment of birth weight and placental weight.

Main Results:

Related Experiment Videos

  • Hemoglobin and hematocrit decreased significantly by 7 weeks gestation, mainly due to plasma volume increase.
  • Placental hormones (hCG, human placental lactogen) at 12 weeks did not correlate with hematologic indices.
  • Neither late-pregnancy hemoglobin concentration/mass nor changes in hematologic indices related to birth weight or placental weight ratio.

Conclusions:

  • Low hemoglobin in late pregnancy is attributed to plasma volume expansion, not poor maternal nutrition.
  • Maternal hematologic changes are not linked to discordant placenta-to-birth weight ratios.